Embedded anchoring socket

ABSTRACT

Anchoring means to be positioned in a concrete structure and comprising a socket adapted for reception of stud, is provided. The socket is embedded in the concrete structure and is provided with means for cooperation with the reinforcing irons in the concrete structure, whereby the force acting through the stud is transmitted to the reinforcing irons.

United States Paten n91 Waerner Jan. 23, 1973 1 EMBEDDED ANCHORINGSOCKET [76] Inventor: Thor Waerner, Graf. Reckestr. 160,

Dusseldorf, Germany 221 Filed: Nov. 27, 1970 21 App1.No,: 93,010

[30] Foreign Application Priority Data Dec. 1, 1969 Norway ..4795/69[52] US. Cl ..52/707, 52/711 [51] Int. Cl. ..E04h 1/38, E04c 5/00 [58]Field of Search ..52/701, 699, 704, 706, 707, 52/711; 248/361 R [56]References Cited UNITED STATES PATENTS 1,455,641 5/1923 Mahon ..52/7072,954,647 10/1960 Lee ..S2/707 3,371,951 3/1968 Bryant ..248/36] R3,420,014 [/1969 Courtois et 31., ..52/706 2,772,560 12/1956 Neptune..52/707 2,957,279 10/1960 McNair .....52/704 1,090,545 3/1914 Kneas..52/701 875,396 12/1907 White ..52/699 1,470,727 10/1923 Hall .t..52/699 Primary Examiner-Henry C. Sutherland Att0rney-Young & Thompson[57} ABSTRACT Anchoring means'to be positioned in a concrete structureand comprising'a socket adapted for reception of stud, is provided. Thesocket is embedded in the concrete structure and is provided with meansfor cooperation with the reinforcing irons in the concrete structure,whereby the force acting through the stud is transmitted to thereinforcing irons.

13 Claims, 13 Drawing Figures PATENTEDJAI123I975 3.712.014

sum 1 [1F 4 INVENTOR THOR WAEE/VE/P PATENTED JAN 23 I975 SHEET 2 OF 4FIG. 5

f 5% N 3 R H OfJN mw m W T o T W M A V B PATENTEDJAH 23 1975 SHEET 3 0F4 INVENTOR B 7/10,? WQfE/VEK l 7 JM ATTORNEYS F IG. 6

EMBEDDED ANCHORING SOCKET The invention relates to a tubular anchoringmeans to be positioned in a concrete structure when casting same, andthe anchoring means is adapted to receive a stud, which at the end to beinserted in the anchoring means is provided with a projecting memberwhich by rotation may be brought into engagement with fastening means inthe tubular anchoring means or socket.

When using precast concrete elements there is a requirement for rapidand safe connection of the concrete elements to hoisting equipment andtransport equipment and there is also a need for means of securing theprecast concrete elements to one another during the building. Theseneeds are met to-day for example by inserting in the precast concreteelements securing means, for example in the form of projecting threadedstuds, eye bolts or the like. It is also known to insert anchoring meansin the form of sockets which are internally threaded and adapted toreceive threaded studs. Use of threaded connections is, however, timeconsuming and the threads are also easily damaged. When eye bolts orprojecting reinforcing rods bent to eyes are used, the embodiments are afairly simple way of providing a connection for the hoisting equipmentwhile such fastening means or anchoring means are not well suited forother purposes, as for example for attaching precast concrete elementsto one another and as provisional means for mounting precast concreteelements to be joined together with mortar. A disadvantage encounteredwith the known anchoring means is also that they will develop ruststains in the finished building structure, as they are made of steel andeven with a good coat of mortar such stains may develop.

It is also known to make the tubular anchoring means as a thin-walledplastic socket and provide the same with an intermediate bottom ofsteel, the bottom having a bore for a securing wing on that end of thestud which is inserted in the socket. The stud is secured in place bybeing inserted in the socket with the wing on the stud inserted throughthe opening in the intermediate bottom, wnereafter the stud is rotatedabout its longitudinal axis until the wing is in abutment with the rearside of the intermediate bottom. This design is fairly inexpensive,because the socket which afterwards is lost, is inexpensive andunsightly rust stains are avoided due to the fact that the socket ismade of plastic.

The invention is a further development of the anchoring means of thelatter type, and a main object is to improve said type of anchoringmeans. The invention is, however, not limited to use of the anchoringmeans in connection with precast concrete elements alone as the scope ofthe invention is wider and the invention therefore also has for itsobject to provide a tubular anchoring means which for example may beused as an anchor for for example mounting of-railings and the like.

A disadvantage encountered with known anchoring means is that theanchorage in the concrete creates certain problems. It has beenattempted to solve the anchoring question by means of a helicalreinforcing member which acts on a projecting collar on the socket, theintermediate bottom of steel being provided in said collar but this willincrease the costs of the use of the anchoring means and the solutionwill further be unsatisfactory under certain conditions.

In accordance with the invention the aim is consequently to design theanchoring means in such a manner that the reinforcing bars present inthe concrete structure can be used and the tubular anchoring meansaccording to the invention is characterized in that the socket isprovided with a retaining means for reinforcing irons which alone or incooperation with the reinforcing. irons form the securing means for thestud.

In a preferred embodiment of the invention the wall of the socket may beprovided with two diametrically opposed recesses or indents wherein thereinforcing irons may be inserted when providing the concrete elementswith anchoring means. In this embodiment the reinforcing irons are useddirectly as abutment for the stud member and the reinforcing irons areheld in correct position in relation to the socket, due to the fact thatthe reinforcing irons are located in the two diametrically opposedrecesses or indents. The use of recesses or indented portions is to alarge extent dependent on the conditions, but it appears to beadvantageous to use recesses as a direct steel-against-steel-contactbetween the wing on the stud member and the reinforcing irons then isobtained. The socket will usually, as mentioned above, be made from aplastic material.

In another preferred embodiment the wall of the socket is provided withtwo diametrically opposed widened portions wherein the respective steelinserts are positioned, extending into the socket and forming thefastening device, as a slot remains between the steel inserts forinsertion of the wing of the stud, the wing engaging the two steelinserts when the stud is rotated about its longitudinal axis. Thereinforcing irons in the concrete structure are then positioned in sucha manner that they abut the two widened portions externally, viewed fromthe inner end of the socket. The advantage of this embodiment comparedto the previously known designs with a cylindrical intermediate bottomis that the steel inserts are cheaper in manufacture that thecylindrical intermediate bottom which must be provided with a securingslot for the wing on the stud and the flat and rectangular shape of thesteel inserts, surrounded by the widened portions of the wall of thesocket, will cooperate with the reinforcing irons in a better manner.

With this design the wall of the socket may externally of the widenedportions, seen from the inner end of the socket and in direct connectionto the widened portions, be provided with indented portions or recessesfor reception of the reinforcing irons in the concrete structure. Thisprovides for a better attachment for the reinforcing irons and thetorques acting in the above mentioned embodiment, in which thereinforcing irons do not act directly opposed to the abutment faces onthe wing of the stud, are avoided.

In order to ensure further the cooperation between the anchoring meansand the reinforcing irons, the

widened portions of the wall of the socket may externally, seen from theinner end of the anchoring means, be provided with outward projectionswhich will prevent the reinforcing irons from being displacedtransversely of the longitudinal axis of the anchoring means, viz. outof the recesses or indents or out of the over riding contact with thewidened portions of the socket. It may be of advantage where recesses orindents are provided in addition to the widened portions to make theprojection so large that the reinforcing irons will have to be snappedin place, whereby the engagement naturally will be improved.

In accordance with the invention the steel insert can be bits cut fromstandard steel rods, so that the manufacture can be rationalized andinexpensive.

In order to improve the facilities for covering the socket after usewhen the socket opening is filled with mortar, the outer end of thesocket may preferably be conical. In order to secure the stud element inthe socket, known securing pins may be used and it is then advantageousto provide the conical wall with two diametrically opposed andlongitudinally extending grooves for reception of such a pin whichextends through a corresponding hole in the stud element. Furtherfeatures of the invention will be evident from the following descriptionand the claims.

The invention will be explained more in detail below with reference tothe drawings showing various preferred embodiments for an anchoringmeans according to the invention.

FIG. 1 is a central longitudinal section through a tubular anchoringmeans in accordance with the invention, cast in concrete,

FIG. 2 is a top view of the anchoring means of FIG. 1 without studinserted,

FIG. 3 is a bottom view or view from the inner end of the anchoringmeans of FIG. 1,

FIG. 4 is a perspective view of one half of a tubular element of thetype shown on FIGS. 1-3, and illustrates one step of the manufacture ofthe tubular element.

FIG. 5 shows the attachment of an anchoring means on the inside of thewall of a casting mould.

FIG. 6 shows a further embodiment for a tubular anchoring means inaccordance with the invention as front view, and

FIG. 7 shows the same anchoring means as side view.

FIG. 8 is a perspective view of one half of a tubular element as shownon FIGS. 6 and 7.

FIG. 9 is a top view of that half which is shown on FIG. 8,

FIG. 10 is a section taken along the line XX on FIG. 9,

FIG. 11 is a perspective view of the tubular element of FIGS. 6 and 7provided with reinforcing irons and a particular holder for reinforcingirons,

FIG. 12 is a top view of the holder for reinforcing irons, and

FIG. 13 is a side view of the holder for reinforcing irons shown on FIG.12.

The anchoring means shown on FIG. 1 consists of a cylindrical socketmember 2 having a conically flared outer portion 17. A stud 19 having asecuring wing 8 is shown inserted in the tubular element and rotated 90to a fastening position in which the securing wing 8 is in engagementwith the rear side of two steel inserts 7 and 9. The steel inserts 7 and9 are placed in corresponding widened portions 6 and 10 of the socket 2(see also FIGS. 2, 3 and 4). Outside the widened portions 6 and 10, seenfrom the inner end of the socket 2 there are provided two recesses 3 and13 in which reinforcing irons 4 and 12 are located as shown on FIG. 1.To ensure additional securement of the reinforcing irons projections 5and 11 are provided on the widened portions 6 and 10, and when thereinforcing irons are to be located in the indented portions 3 and 13,the reinforcing irons must be pressed past said projections 5 and 1 l Atthe top of the tubular element in the flared conical portion 17, thereare two diametrically opposed and longitudinally extending grooves 16and 18. The grooves act as guide grooves for the securing pin 15 whichextends through a hole for same in the stud 14. There are twodiametrically opposed grooves 16 and 18 so that it will always bepossible to position the securing pin 15 in one of them iri'espective ofwhich way the stud 14 is turned when fastening same to the socket. Thepin 15 secures the stud 14 against rotation out of engagement with thesteel inserts 7 and 9.

The steel inserts 7 and 9 form between them an elongated slot 19,through which the securing wing 8, which is formed by a flattenedportion of the stud 14, can be moved when inserting and removing thestud 14 from the socket 2. When the stud 14 is inserted all the way intothe socket, the stud is rotated and the securing wing 8 will then engagethe rear side of the steel inserts 7 and 9. The stud is then secured inthis position by means of the pin 15 shown on FIG. 1.

As will be evident from FIG. 1 it is possible to fill the tubularelement when it is no longer to be used, with mortar, and the conicalportion 17 provides for a better adhesion for the mortar at the sametime as unsightly rust stains are avoided due to the fact that thecomplete socket 2, 17 consists of plastics, the only remaining steelobjects being the inserts 7 and 9 which possibly may give rise to ruststains at a later date, but the steel inserts are very small and locateddeep in the socket.

The anchoring means shown on FIGS. 14 are preferably made by casting oftwo similar halves indicated by the dividing line 21 on FIG. 3, and amoulded half of a socket is shown in perspective view on FIG. 4. Thecentral section shown on FIG. 1 follows the plane of division betweenthe two halves.

On FIGS. 2-4 one will see that the halves 2a and 2b completes each otherto form the socket 2. In the same manner the conical portion 17acompletes itself with the corresponding portion 17b for formation of theconical funnel portion 17. The same is true for the portions which onFIGS. 2-4 are given the letters a and b after the reference number.

When manufacturing the anchoring means the half element on FIG. 4 ismoulded, whereafter the steel inserts 7 and 9 are positioned in thewidened space 64 and 10a. Then a corresponding half 2b of the socket ispositioned and the components welded together to a unit preferably byultra sonic welding. The anchoring means is now finished and isforwarded to the concrete casting form in order to be positioned in amould for concrete casting.

When the anchoring means is to be cast into the concrete structure, theanchoring means is attached to the inside of the wall of the mould forthe concrete casting in the manner shown on FIG. 5.

FIG. 5 shows how the anchoring means 2 is clamped to the inside of awall 22 of a mould. The anchoring means 2 is held in position on theinside of the wall 22 of the mould by means of the expansion member 23,which consists of an expansion bolt 24 with a conical head 25 and threeexpansion clamps of which only two, viz. expansion clamps 26 and 27 areshown on the drawing. The expansion clamps 26 and 27 have an outer formcorresponding to the internal form of the socket 2, and by tighteningthe expansion bolt 24 by means of the nut 28, the expansion clamps willexpand outwardly and hold the socket 2. FIG. 5 also shows how thereinforcing irons 4 and 12 are positioned in place for anchoring of thesocket 2 in the subsequently cast concrete building element. After thecasting is ended, the bolt 24 and the expansion device remains in themould wall 22 when this wall is removed.

On FIGS. 1 and 4 a stopper 43 for the wing 8 is shown, for arresting thewing in securing position. When inserting the stud 14 it is rotated sothat it will abut against the two stoppers 43 and the stud will thenstop in correct position for securing and for insertion of the pin 15.

The anchoring means 46 on FIG. 6 is assembled from two similar halves 47and 48. One half 48 is shown in perspective view on FIG. 8 and is onFIG. 9 seen from that side where the joint is. On FIG. 8 the lower halfof the socket is drawn transparent in order to show the internalconstruction.

The halves of the socket are moulded preferably of a plastic materialand are provided with steel inserts 49, 50. The steel inserts are cutfrom standard steel profiles, the profile forming a circle segment. Forreception of the steel inserts 49 and 50 each socket half is providedwith reception pockets 51, 52. When manufacturing the anchoring means 46the half shown on FIG. 8 is moulded, whereafter the steel inserts 49 and50 are positioned in the pockets 5], 52. Then a corresponding mouldedhalf 47 is positioned on top of the other and the two halves are weldedtogether preferably by ultra sonic welding. The anchoring means is nowready and may be shipped to the concrete casting form in order to beincluded in the cast products. When the anchoring means is to be castinto the concrete it is attached in a suitable manner on the inside ofthe wall of a concrete casting mould in the same manner as shown on FIG.5. The anchoring means 46 does not have the conically flared end and istherefore positioned with its open end at a distance from the wall ofthe casting mould for the concrete, while the clamping device is sodesigned that there is sufficient space for insertion of the pin.Reference is here made to the previous description of the otherembodiments where the operating principle is explained more in detail.

The anchoring means 46 is suited for use in connection with a studhaving securing wings in the manner explained in connection with theembodiment on FIG. 1, but the stud can also be modified in such a mannerthat its upper part has an enlarged diameter so that the stud will fitwith a small clearance in the cylindrical space formed by the twocylinder halves 53, 54. A better support of the stud is thereby obtainedand the chance of bending the stud due to obliquely acting strains arereduced. Each half is provided with a pocket shaped recess 55, 56. Thesepockets serve to receive the end of the pin which is inserted into thestud which is not shown, so that the pin is secured in the socket.

The anchoring means has two diametrically opposed recesses 57, 58 forreception of reinforcing irons. The recesses are at the bottom wellrounded and follows the rounded shape of the steel inserts 49 and 50, sothat the reinforcing irons can follow the rounded shape and recesses 57,58 there is provided a bead 59, 60 inside which there is a bed for thereinforcing irons as particularly shown on FIG. 10.

Each half is provided with a flanged joint 61, 62, 63. The flanges areprovided with guiding pins 64, 65 and corresponding holes 66, 67. Thelower flange 63 has a widened portion 68 extending out from the bottom69 of the tubular element. The widened flange part 68 serves to retain aholder 70 for reinforcing irons as explained below.

In the same manner as for the embodiments on FIGS. 1 and 4 the tubularelement 46 is provided with stoppers for the securing wing on the studto be inserted into and fastened in the tubular member. As the sockethalves are similar, each half is provided with only one stopper which onFIGS. 8, 9 and 10 are referred to as 71. When inserting the stud, thestud is rotated 90 and will then be in engagement with the two stoppers71. Then the pin may be inserted in the same manner as shown on FIG. 1,the end of the pin inserted in the stud then extending into the pocket55 or the pocket 56.

FIG. 11 shows a perspective view of the anchoring means connected toreinforcing irons 72, 73. The reinforcing irons are positioned in therecesses 57 and 58 and rest behind the beads 59 and 60. The curved shapeof the steel inserts and the wall of the socket in this area enables thereinforcing irons to have a uniform and suitable curvature.

The better to hold the reinforcing irons in correct positions, theholder for reinforcing irons which is shown on FIGS. 12 and 13, and onFIG. 11 is shown in position, can with advantage be used. The holderconsists of a base plate 74 which in each corner is provided with a clip76, 77, 78 and 79. In the center the base plate is provided with arectangular hole 80, the length of which corresponding to the widenedflange portion 68 and the width of which corresponding to. the doublewidth of a flange. In this manner the holder 75 can be entered on thetwo juxtaposed flange extensions 68 as indicated by dotted lines on FIG.6. The reinforcing irons 72, 73 are pressed into corresponding clips 76,78 and 77, 79 as shown on FIG. 11.

The anchoring means shown on FIGS. 6-11 can, of course, be modified bybeing provided with a flared conical end as for example shown for thesocket on FIG. 4.

For all the embodiments shown, the clamping method explained inconnection with FIG. 5 can be used.

Having described my invention, I claim:

1. Tubular anchoring means embedded in a reinforced concrete structure,said means having an open outer end at the surface of the structure andan inner end inwardly thereof, said means receiving and retaining a studhaving a wing at an inner end thereof, said anchoring means comprising atubular socket having transversely extending shoulders disposed onopposite sides of the socket, said wing underlying said shoulders,reinforcing members of the concrete lying on the side of said shouldersopposite said wing, and means to transmit force from said inserted wingthrough said shoulders to said reinforcing members, saidforcetransmitting means comprising metallic inserts within said socketon opposite sides of said stud and disposed between said wing and saidshoulders.

2. Tubular anchoring means as claimed in claim 1, said socket havingmeans enclosing said inserts on all sides.

3. Tubular anchoring means as claimed in claim 2, said socket being aplastic material and said inserts being metal.

4. Tubular anchoring means as claimed in claim 1, said shouldersextending inwardly of the outer contour of said tubular socket, saidsocket having oppositely outwardly opening imperforate recesses in itsside walls for the reception of said reinforcing members, said shoulderseach defining one of the side walls of one of said recesses.

5. Tubular anchoring means as claimed in claim 4 said shoulders beingconvex in a direction toward the open end of said socket.

6. Tubular anchoring means as claimed in claim 5, said inserts beingconvex in the direction of said open end of said socket and underlyingand supporting said convex shoulders.

7. Tubular anchoring means as claimed in claim 1, said shoulders beingconvex in the direction of the open end of said socket.

8. Tubular anchoring means as claimed in claim 7, saidforce-transmitting means comprising inserts within said socket, saidinserts being convex in the direction of the open end of the socket andunderlying and supporting said shoulders.

9. Tubular anchoring means as claimed in claim 1, said reinforcingmembers being disposed in imperforate oppositely outwardly openingrecesses in the side wall of said socket, each of said shoulderscomprising one side wall of a said recess.

10. Tubular anchoring means as claimed in claim 1, and means within saidsocket for limiting rotation of said wing within said socket.

l1. Tubular anchoring means as claimed in claim 1, said socket being ofplastic material in the form of two halves with flanges along theiredges, the flanges of the halves being secured together.

12. Tubular anchoring means as claimed in claim 11, saidforce-transmitting means comprising steel inserts within said socket andextending between said two halves.

13. Tubular anchoring means as claimed in claim 12, each of said halvesproviding a recess for half of a said steel insert.

l II!

1. Tubular anchoring means embedded in a reinforced concrete structure,said means having an open outer end at the surface of the structure andan inner end inwardly thereof, said means receiving and retaining a studhaving a wing at an inner end thereof, said anchoring means comprising atubular socket having transversely extending shoulders disposed onopposite sides of the socket, said wing underlying said shoulders,reinforcing members of the concrete lying on the side of said shouldersopposite said wing, and means to transmit force from said inserted wingthrough said shoulders to said reinforcing members, saidforce-transmitting means comprising metallic inserts within said socketon opposite sides of said stud and disposed between said wing and saidshoulders.
 2. Tubular anchoring means as claimed in claim 1, said sockethaving means enclosing said inserts on all sides.
 3. Tubular anchoringmeans as claimed in claim 2, said socket being a plastic material andsaid inserts being metal.
 4. Tubular anchoring means as claimed in claim1, said shoulders extending inwardly of the outer contour of saidtubular socket, said socket having oppositely outwardly openingimperforate recesses in its side walls for the reception of saidreinforcing members, said shoulders each defining one of the side wallsof one of said recesses.
 5. Tubular anchoring means as claimed in claim4 said shoulders being convex in a direction toward the open end of saidsocket.
 6. Tubular anchoring means as claimed in claim 5, said insertsbeing convex in the direction of said open end of said socket andunderlying and supporting said convex shoulders.
 7. Tubular anchoringmeans as claimed in claim 1, said shoulders being convex in thedirection of the open end of said socket.
 8. Tubular anchoring means asclaimed in claim 7, said force-transmitting means comprising insertswithin said socket, said inserts being convex in the direction of theopen end of the socket and underlying and supporting said shoulders. 9.Tubular anchoring means as claimed in claim 1, said reinforcing membersbeing disposed in imperforate oppositely outwardly opening recesses inthe side wall of said socket, each of said shoulders comprising one sidewall of a said recess.
 10. Tubular anchoring means as claimed in claim1, and means within said socket for limiting rotation of said wingwithin said socket.
 11. Tubular anchoring means as claimed in claim 1,said socket being of plastic material in the form of two halves withflanges along their edges, the flanges of the halves being securedtogether.
 12. Tubular anchoring means as claimed in claim 11, saidforce-transmitting means comprising steel inserts within said socket andextending between said two halves.
 13. Tubular anchoring means asclaimed in claim 12, each of said halves providing a recess for half ofa said steel insert.